Changed the freeSpaceQueryURL Regex in order to prepare for the parsing of the EOS Space name in DiskSystem

cta-migration-tools does not need castor-dbtools, it is sufficient to
depend on cx_Oracle.

Revert "vanilla eos 4.6.2 is not a drop in replacement 4.6.2-20191118180911git0fe7966 is compiled against standalone xrootd 4.11"

This reverts commit b2157fe9f0d685640db34e6b78101f917554a54a.

vanilla eos 4.6.2 is not a drop in replacement 4.6.2-20191118180911git0fe7966 is compiled against standalone xrootd 4.11

Revert "Modified cta.spec.in to avoid problem with official Oracle RPMS not listing libocci.so as a capability"

This reverts commit 62179df5.

Revert "Modified cta.spec.in to deal with the fact that that the official ORacle rpms do not list the 64-bit version of the libclntsh.so capability"

This reverts commit 338d7775.

Revert "Added oracle-instantclient-tnsnames.ora which was implicitly being installed by oracle-instantclient19.3-meta which we no longer install"

This reverts commit 8083df2a.

This reverts commit eede4fb2.

Added oracle-instantclient-tnsnames.ora which was implicitly being installed by oracle-instantclient19.3-meta which we no longer install

Modified cta.spec.in to deal with the fact that that the official ORacle rpms do not list the 64-bit version of the libclntsh.so capability

Modified cta.spec.in to avoid problem with official Oracle RPMS not listing libocci.so as a capability

Upgraded to EOS 4.6.1-20191104142842git30eddf6 in order to get the missing commits for being able to configure the EOS space written to be tape servers

Changed the log message at the starting of cta-taped. If an exception happens, the error messages will tell that cta-taped cannot start.

Upgraded to EOS 4.6.1-20191106151453git21dd306 in order to be able to configure the EOS space written to be tape servers

Corrected cta-objectstore-initialize program. The agent needed to initialize the objectstore was not locked so could not be deleted.
If this program fails for whatever reason, it will return EXIT_FAILURE and not EXIT_SUCCESS

This reverts commit e5f27c34.

This reverts commit edf98416.

docker/ctafrontend/cc7/opt/run/bin/init.sh now installs the standard oracle-instantclient19.3-sqlplus rpm instead of the CERN version

Revert "Top CMakeLists.txt now explicitly lists all the REQUIRED components to be found by cmake/Findoracle-instantclient.cmake"

This reverts commit 0ee95f93.

Modified Findoracle-instantclient.cmake to explicitly look for libocci.so.19.1 because the oracle-instantclient19.3-devel rpm does not create the symbolic link /usr/lib/oracle/19.3/client64/lib/libocci.so

Top CMakeLists.txt now explicitly lists all the REQUIRED components to be found by cmake/Findoracle-instantclient.cmake

- Added tool to drop from the CTA catalogue all CASTOR tapes from a given tapepool.
  This tool makes use of a temporary table and an additional PL/SQL procedure
  in order to perform efficient bulk operations in the CTA catalogue.
- Made tapepool insertion idempotent.
- Updated documentation.